/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import { instanceMap } from './map'
import {
  getRootElement
} from '../app/ctrl/index'

/**
 * Get a whole element tree of an instance for debugging.
 * @param  {string} id
 * @return {object} a virtual dom tree
 */
export function getRoot (id) {
  const instance = instanceMap[id]
  let result
  /* istanbul ignore else */
  if (instance) {
    result = getRootElement(instance)
  }
  else {
    result = new Error(`invalid instance id "${id}"`)
  }
  return result
}
